Simple chat program with node.js

chat.js

var net = require('net');
var carrier = require('carrier');

var connections = [];
	
net.createServer(function(conn) {
	
	connections.push(conn);
	
	conn.on('close', function() {
		var pos = connections.indexOf(conn);		
		if (pos >= 0) {
			connections.splice(pos, 1);
		}
	});
	
	conn.write("Hello, welcome to this chat server!\n");
	conn.write("Please input your name:\n");
	
	var username;
	
	carrier.carry(conn, function(line) {
		if (!username) {
			username = line;
			conn.write("Hello " + username + "!\n");
			return;
		}
		
		if (line == 'quit') {
			conn.end();
			return;
		}	

		var feedback = username + ": " + line + "\n";
		
		connections.forEach(function(one_connection) {
			one_connection.write(feedback);
		});				
	});	
	
}).listen(4000);